Hydraulic press.



No. 690,968. Patented Jan. l4, 11902. F. E. KEYES. HYDRAULIC PRESS. (Application med Julie 26, 1901.

2 Sheets-Sheet (No Model.)

W] 5555. bu) A y. 51W NTOR Attorney F. E. KEYES.

HYDRAULIC PRESS.

(Application filed June 26, 1901.!

Patented Ian. l4, I902.

[NVENTOR UNKTFD rains arm FFJIQE.

FRANK EUGENE KEYES, OF I-IOLYOKE, MASSACHUSETTS.

HYDRAULIC PRESS.

SPECIFICATION forming part of Letters Patent No. 690,968, dated January 14, 1902. 7

Application filed June 26, 1901.

T0 aZZ whom it may concern.-

Be it known that I, FRANK EUGENE KEYES, of Holyoke, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Hy draulic Presses; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use-the same.

My invention relates to an improvement in hydraulic presses, the object being to provide an apparatus capable of exerting enormous pressure upon very large surface areas, and therefore suitable for many purposes for which ordinary hydraulic presses cannot be advantageously employed.

With this end in View my invention consists in the combination of a rain, a platen,

and toggle or knuckle joints.supporting the platen and connected to the ram in such a manner as to be straightened or extended by a lateral thrust at the moment when the greatesteffect is required upon the substance being pressed.

My invention further consists in the parts and combinations of parts, as will be more fully described, and pointed outin the claims.

In the accompanying drawings, Figure 1 is a view in elevation, partly in section, of my improved press. Fig. 2 is a view in end elevation, partly in section. Fig. 3 is a view in plan of one of the thrust-plates, and Fig. 4 is a View showing the toggle system extended for application to a larger platen.

1 represents the base or bed plate, at the corners of which are columns 2 for supporting the top 3 of the press and securely uniting the same to the base in the usual manner. Located centrally within the base is an ordinary hydraulic cylinder l, which may be connected to a pump in the usual manner. The ram is arranged to work vertically in the cylinder and is preferably made in two sections 6 and 7, the section 7 working in the cylinder, while the upper section 6 is reduced in diameter and is provided at its lower end with a flange 8, which latter rests on and is bolted or otherwise secured to a similar flange 9 on the lower section 7. The upper reduced end of section 6 of the ram moves in a socket 10 in the platen 11, and the parts are so con- Serial No. 66,119. (No model.)

structed with relation to each other and to the toggle-links hereinafter referred to that when the toggle-links are straightened and the platen in its highest position the upper end of the ram rests in contact with the platen and supports same centrally. \Vith this construction the end of the ram gradually approaches the platen and is sufliciently close thereto while the maximum pressure is being applied to prevent any material deflection of the platen at or near the center of the latter, and as the platen furnishes its stroke it engages the latter and positively supports the same at its center. Again, by providing the platen with a socket in which the upper end of the ram enters the upper end of the ram will be supported against lateral deflection by unequal pressure on the thrust-plates. The platen is supported near each end on a toggle-joint consisting of a pair of strong links 12, jointed together and resting with one end of one link upon a series of steel rollers 11, (shown in section in Fig. 1,) seated in a recess in the bracket or bearing 15, the

rollers being held in place by a plate 16,

while the free end of the other link 12 rests within seats formed in the under side of the platen 11. Thus by straightening the links the platen is elevated, and by permitting the links 12 to fold or close the platen will be lowered. These toggle-links are opened or straightened out and closed or folded up by the ascent and descent, respectively, of the ram through the agency of the ribbed plates 17. These plates each extend from the ram to its respective links and are pivotally secured to the latter by the bolt 18, which latter also pivotally secures the two links together. The inner ends of the plates 17 rest on the shoulder of the ram and the juncture of the sections 6 and 7, and the two plates 17 are connected together by the yoke 19, and the latter is locked to the plunger by a bolt or other device, so that the plates 17 must move in unison with the ram.

The construction of my improved machine is such that normally the platen is supported solely by the links 12, the top of the ram or plunger being below the lower face of the platen, as shown in dotted line, Fig. 1. As the ram rises its movement is greater than the lateral thrust of the plates 17. Hence by the time the links 12 have been opened or straightened out the plunger will have entered the socket 10 in the lower face of the platen and moved into engagement with the platen. From this it will be seen that when the platen is exerting its greatest pressure it is supported near its ends and also at its center.

In the construction shown in Fig. 4 I have shown a system of toggles and thrust-plates for a longer press, the links being coupled up, as shown, so as to be moved in unison by the movements of the ram or plunger. With this construction the platen can be made of any size and width and supported at regular or irregular intervals by toggle-links, which not only support the platen, but applylifting power simultaneously at the several points.

It is evident that many slight changes might be made in the relative arrangementof parts herein shown and described without departing from the spirit and scope of my invention. Hence I would have itunderstood that I do not wish to confine myself to the exact construction of parts herein shown and described; but, I Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a hydraulic press, the combination ceases with a platen and a ram, the former havinga socket in its lower face to receive the upper end of the ram as the latter rises, of a series of toggle-links engaging the platen and means connecting the links and ram whereby the former is actuated by the latter.

2. In a hydraulic press, the combination with a platen and a ram, the former having a socket in its lower face to receive the upper end of the ram, of toggle-links on opposite sides of the ram and engaging and supporting the platen at or near its ends, and thrustplates connecting the rain and toggle-links, substantially as set forth.

3. In a hydraulic press the combination with a platen and a ram, the face of the platen adjacent to the ram having a socket to receive the free end of the ram as the latter moves outwardly, of toggle-links supported on antifriction-bearings and supporting the platen, and thrust-plates connecting the ram and toggle-links.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

FRANK EUGENE KEYES.

Witnesses:

A. W. BRIGHT, G. F. DOWNING. 

